Just remove the subdatasheet from the same menu as you'd use to add it?
I doubt there's many (maybe none) experienced users here who use this. For one thing, users should not be poking around in tables (only forms and reports) and if you abide by that principle, these are not needed.
Maybe you found another way to insert a sheet - I'm referring to the Home>Records>More submenu.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.